JPH0440024Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention is an elastic joint that is used with an air clutch, etc. to transmit power from a driving shaft to a driven shaft, and is a heat-insulating donut-shaped joint with a heat-insulating structure. Regarding elastic joints.

<Prior Art> Conventionally, as a shaft coupling device that uses both an air clutch and a doughnut-shaped elastic joint, one shown in FIG. 6 is known. This shaft coupling device incorporates a donut-shaped elastic coupling 31 inside an air clutch 30 in order to shorten the axial length and utilize space. The air clutch 30 includes a frame holder 33 coaxially fixed to the end of the drive shaft 32, and a rim 3 attached to the frame holder.
4, an annular rubber tube 35 attached to the inner periphery of this rim, and a friction shoe 36 that is divided and fixed to the inner periphery of this rubber tube.
An inner ring 38 coaxially fixed to the 7 ends, and an annular vibration-proofing rubber 3 whose inner periphery is vulcanized and bonded to the outer periphery of this inner ring.
9, and an outer drum 40 in which the outer periphery of this vibration-proof rubber is vulcanized and adhered to the inner periphery. Then, the friction shoe 36 of the rubber tube 35, which expands and contracts in the radial direction with the compressed air supplied and discharged through the drive shaft center and the air pipe 41, presses against or separates from the outer drum 40 from the outside, causing friction caused by the press. Power is transmitted or cut off from the drive shaft 32 to the driven shaft 37 depending on the force.

<Problems to be Solved by the Invention> If the air clutch 30 is frequently engaged and disengaged or slowly engaged in the shaft coupling device described above, the friction shoe 36 and the outer drum 40 may repeatedly press against each other and slip into each other for a long period of time. As a result, a large amount of frictional heat is generated. Also, when transmitting power, an air source or an air pipe 41
If the air pressure decreases due to a failure such as this, the friction shoe 36 and the outer drum 40 become half-clutched, and a large amount of frictional heat is also generated.
Since the friction shoe 36 is usually made of a heat insulating material such as a resin mold, a large amount of frictional heat is transferred to the outer drum 40, that is, the donut-shaped elastic joint 3.
This will be transmitted to the first side.

By the way, the above-mentioned conventional donut-shaped elastic joint 31
Since the structure is simply that the vibration-proofing rubber 39 is vulcanized and bonded between the inner and outer rings 38 and 40, a large amount of frictional heat transmitted to the outer ring drum 40 is directly transmitted to the vibration-proofing rubber 39, and the vibration-proofing rubber However, it has the serious drawback that it deteriorates due to thermal decomposition, cracks and breaks, and as a result, it no longer performs its power transmission function. In order to reduce the conduction of frictional heat to this anti-vibration rubber,
Although there is a donut-shaped elastic joint 31 in which the outer drum 40 is made hollow as shown in FIG.
The reality is that it is damaged.

Therefore, the purpose of this invention is to create a heat-insulating doughnut-shaped elastic joint that can effectively block heat transfer from members that generate frictional heat using air clutches, etc., and that will not cause deterioration or damage to the vibration isolating rubber due to frictional heat. It is to provide.

<Means for Solving the Problems> In order to achieve the above object, the insulated doughnut-shaped elastic joint of the present invention has an inner ring coaxially fixed to the end of the rotating shaft, and an inner periphery fixed to the inner ring. an annular anti-vibration rubber; an outer ring with the outer periphery of the anti-vibration rubber fixed to the inner periphery; a drum arranged with an annular space around the outer periphery of the outer ring; It is characterized by comprising annular heat insulating plates that abut each other, and an annular end plate that connects the drum and the outer ring via the heat insulating plates.

<Function> The outer periphery of the drum, which is connected to the rotating shaft through the outer ring, anti-vibration rubber, and inner ring, is connected to the friction shoe of an air clutch, for example, provided at the end of the rotating shaft that faces the rotating shaft during power transmission. Generates heat through frictional contact with the inner circumference. However, since there is an annular space between the drum and the outer ring, and the two are connected only through the heat insulating plate by the end plate, the conduction of frictional heat from the drum to the outer ring and then to the vibration isolating rubber is effective. This prevents deterioration or damage of the anti-vibration rubber due to frictional heat.

<Example> Hereinafter, the present invention will be explained in detail with reference to the illustrated example.

FIG. 1 is an axial cross-sectional view of the heat-insulating donut-shaped elastic joint of the present invention incorporated inside the same air clutch 30 (see FIG. 6) as the conventional example, where 1 is a driven shaft and 3 is a driven shaft. An inner ring 4 coaxially fixed to the flange 1a at the end of the drive shaft with bolts 2; 4 is an annular anti-vibration rubber whose inner periphery is vulcanized and bonded to the inner ring 3; 5
6 is an elastic joint unit consisting of the inner ring 3, anti-vibration rubber 4 and outer ring 5, and 6' is an inner ring 3' and anti-vibration rubber 4. ', an elastic joint unit of the same shape consisting of an outer ring 5', 7 an intermediate ring that axially connects both elastic joint units 6, 6' in the inner rings 3, 3', and 8 an intermediate ring 7 that connects the inner rings 3, 3' and the intermediate ring 7. bolts that connect together,
Reference numeral 9 denotes a drum disposed on the outer periphery of the outer rings 5, 5' with an annular space A therebetween; 11, 11 annular heat insulating plates abutting both end surfaces of the drum 9 and each end surface of the outer rings 5, 5', respectively; 10, 10 to this insulation board 11,
It is an annular end plate connected via bolts 12 and 13 with 11 in between.

Further, reference numeral 14 denotes through holes provided in the radial direction at each position dividing the circumference of the intermediate ring 7 into eight equal parts (see Fig. 2);
Reference numeral 15 denotes through holes provided at respective positions dividing the inner periphery of the end plate 10 into 12 equal parts so as to penetrate the end plate, the heat insulating plate 11, and the drum 9 in the axial direction and communicate with the annular space A.

The intermediate ring 7 is a narrow ring having the same outer diameter as the inner rings 3, 3' and slightly thicker in the radial direction, and the inner rings 3, 3' are inserted into annular grooves 7a, 7a provided on both end faces, respectively. It's embedded. This intermediate ring 7 forms a gap B between the two vibration isolating rubbers 4 and 4', and an annular gap C as a through hole between the outer rings 5 and 5'. 7 through hole 14
communicates the inner space D of the inner rings 3, 3' with the gap B, and the annular gap C communicates the gap B with the annular space A. The outer circumferences 5a, 5'a of the outer rings 5, 5' forming the annular space A form a symmetrical truncated conical surface whose diameter expands from the annular gap C toward both ends, while the inner circumference of the drum 9 facing this The circumference 9a is
An annular surface is formed parallel to the truncated conical surface at a constant interval. The inner ring 3 is fitted into an annular groove 1b provided on the outer periphery of the end face of the flange 1a at the end of the driven shaft, and as shown in FIG. Fixed. Bolts 12 and 13, which are inserted through the end plate 10 and connect the drum 9 and the outer rings 5 and 5', are arranged between the through holes 15 arranged in the circumferential direction of the end plate 10.

The air-cooled doughnut-shaped elastic joint configured as described above operates as follows.

When compressed air is supplied to the rubber tube 35 of the air clutch 30 attached to the rotating drive shaft 32 through the air pipe 41, the rubber tube 35
Due to the expansion, the friction shoe 36 protrudes radially inward and begins to come into contact with the outer periphery of the drum 9. At this time, a large amount of frictional heat is generated due to the frictional contact between the friction shoe 36 and the drum 9, and since the friction shoe 36 is made of a heat insulating material, this frictional heat is transferred radially inward on the drum 9 side. trying to convey.
However, since the drum 9 is not in direct contact with the outer rings 5, 5' and is only connected at both ends with the end plate 10 and the bolts 12, 13 via the heat insulating plate 11, the frictional heat is slightly absorbed by the bolts 12, 13. ,
The heat is only conducted to the outer rings 5, 5' via the end plate 10 and the bolt 13, and temperature rise due to frictional heat in the outer rings 5, 5' is suppressed. Furthermore, as shown in Figure 8,
Bolts 12 provided on the heat insulating plate 11 and end plate 10
If the hole for the drum 9 is made into a loose hole and a heat insulating washer 25 is installed between the end plate 10 and the bolt 12, heat transfer from the drum 9 to the outer rings 5, 5' will be almost eliminated.
5' temperature rise due to frictional heat is significantly suppressed. On the other hand, the inner space D of the inner rings 3, 3' with one end open
The air swirls along the inner circumference of the inner ring due to the centrifugal force caused by the rotation of the driven shaft 1, and flows through the through hole 1 of the intermediate ring 7.
4. Then, as shown by the arrow in FIG. 1, the rubber flows radially outward through the gap B between the vibration isolating rubbers 4 and 4', passes through the annular gap C between the outer rings 5 and 5', and then flows in the axial direction. It is divided into left and right parts, and circulates through the annular space between the outer rings 5, 5' and the drum 9, and the end plates 10,
10 through holes 15, 15, respectively, to the outside. This circulating air cools the vibration isolating rubber 4, outer rings 5, 5', and drum 9, and suppresses heat transfer from the drum to the outer ring via the air.
The temperature rise of the outer rings 5, 5' and the vibration isolating rubbers 4, 4' is significantly suppressed. Therefore, even if the drum 9 generates excessive frictional heat due to frequent engagement and disengagement of the air clutch 30, slow engagement, or a half-clutch state due to a malfunction of the compressed air system, the heat insulating effect of the heat insulating plate and the cooling effect of the flowing air are maintained. As a result, the temperature rise of the vibration isolating rubbers 4, 4' can be effectively suppressed, and the vibration isolating rubbers will not deteriorate or be damaged. Moreover, since the annular space A is inclined so as to expand toward both ends, the circulation of air can be promoted and the cooling effect can be further improved.

FIG. 3 is a cross-sectional view showing a modified example of the intermediate wheel.
This intermediate wheel 17 is located at each position dividing the circumference into eight equal parts.
The through hole 18 is provided so as to be inclined toward the direction of rotation of the intermediate ring (see arrow E), which makes it easier for air to flow in with rotation, thereby further improving the cooling effect.

FIG. 4 shows a modification of the through hole communicating with the annular space A. In this modification, the end plate 10, the heat insulating plate 1
A through hole 19 is provided through the drum 1 and the drum 9 with an inclination equal to that of the annular space A, thereby making it easier for air to flow out and increasing the cooling effect.

FIG. 5 is an axial cross-sectional view of a modified example in which four elastic joint unit rows 6 each comprising the inner ring 3, anti-vibration rubber 4, and outer ring of the above embodiment are connected in the axial direction. In this modification, four elastic joint units 6 are successively connected by three intermediate rings 7, and these are connected together with bolts 20, while two on the left and right of the four outer rings 5 are connected by large diameter intermediate rings. 21, 21, and these are integrally connected with bolts 24, 24 inserted from the end plate 10 side, and both end surfaces of the drum 23, which is arranged with an annular space A around the outer periphery of the four outer rings 5, are insulated. It is connected to the end plate 10 by bolts 12 with a plate 11 in between. The intermediate ring 21 is provided with a plurality of radial through holes 22, and the annular space A is inclined so as to expand from the annular gap C at the center of the outer ring 5 toward both ends. This modified example not only provides the same heat insulating effect and cooling effect as in the above embodiment, but also has the advantage of being able to transmit a larger torque.

In the above embodiments and modifications, the elastic joint units 6 are sequentially connected by the intermediate ring 7 to form the gap B between the anti-vibration rubbers and the through hole C in the outer ring. It is also possible to fix a plurality of vibration isolating rubbers at intervals in the axial direction between the outer rings and provide through holes in the inner and outer rings to form air flow passages, or if you sacrifice the air cooling effect, these It is also possible to omit the through hole. It is also possible to reverse the driving shaft and the driven shaft to those in the embodiment.

<Effects of the invention> As is clear from the above explanation, the heat-insulating donut-shaped elastic joint of the invention has an inner ring coaxially fixed to the end of the rotating shaft, and an annular ring whose inner periphery is fixed to the inner ring. A vibration isolating rubber, an outer ring having the outer periphery of the vibration isolating rubber fixed to the inner periphery, a drum arranged with an annular space around the outer periphery of the outer ring, and abutting both end surfaces of the drum and both end surfaces of the outer ring, respectively. An annular insulation board,
Since it is equipped with an annular end plate that connects the drum and the outer ring through this heat insulating plate, even if the friction of the rotating air clutch etc. comes into frictional contact with the outer periphery of the drum and generates intense frictional heat, There is an annular space between the drum and the outer ring, and the two are connected only through the heat insulating plate by the end plate.
The conduction of frictional heat from the drum to the outer ring and further to the anti-vibration rubber is effectively prevented, the rise in temperature of the anti-vibration rubber is suppressed, and deterioration and damage of the anti-vibration rubber due to frictional heat is prevented.

[Brief explanation of the drawing]

Fig. 1 is an axial cross-sectional view of the heat insulating donut-shaped elastic joint of the present invention incorporated inside an air clutch, Fig. 2 is a half-cut front view of the donut-shaped elastic joint of Fig. 1, and Fig. 3 is a cross-sectional view of the intermediate wheel. A cross-sectional view showing a modified example; FIG. 4 is a partial cross-sectional view showing a modified example of the through hole;
Fig. 5 is an axial sectional view of a modified example with four elastic joint units, Figs. 6 and 7 are axial sectional views of a conventional donut-shaped elastic joint, and Fig. 8 is a drum and end of the present invention. FIG. 7 is a partial cross-sectional view showing a method of insulating bolts for fixing the face plate. 1... Driven shaft, 2... Bolt, 3... Inner ring,
4... Anti-vibration rubber, 5... Outer ring, 6... Elastic joint unit, 7, 21... Intermediate ring, 8, 20... Bolt, 9... Drum, 10... End plate, 11... Heat insulation plate , 12, 13, 24... Bolt, 14, 22
...Through hole, 15...Through hole, 30...Air clutch, 32...Drive shaft, 35...Rubber tube,
36... Friction show, A... Annular space,
B... Gap, C... Annular gap, D... Inner space.

Claims (1)

[Scope of utility model registration request] An inner ring coaxially fixed to the end of the rotating shaft, an annular anti-vibration rubber whose inner periphery is fixed to the inner ring, an outer ring with the outer periphery of this anti-vibration rubber fixed to the inner periphery, and an outer ring fixed to the outer periphery of the outer ring. A drum arranged with an annular space, an annular heat insulating plate abutting both end surfaces of the drum and both end faces of the outer ring, and an annular end plate connecting the drum and the outer ring via the insulating plate. An insulated donut-shaped elastic joint characterized by: